/*
 * Copyright (c) 2003, Rafael Steil
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met:
 * 
 * 1) Redistributions of source code must retain the above 
 * copyright notice, this list of conditions and the 
 * following  disclaimer.
 * 2)  Redistributions in binary form must reproduce the 
 * above copyright notice, this list of conditions and 
 * the following disclaimer in the documentation and/or 
 * other materials provided with the distribution.
 * 3) Neither the name of "Rafael Steil" nor 
 * the names of its contributors may be used to endorse 
 * or promote products derived from this software without 
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT 
 * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, 
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
 * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 
 * IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
 * 
 * This file creation date: Mar 29, 2003 / 1:15:50 AM
 * The JForum Project
 * http://www.jforum.net
 */
package org.vectrics.user;

import java.security.NoSuchAlgorithmException;

import org.apache.log4j.Logger;
import org.vectrics.SystemException;
import org.vectrics.provider.CoreServiceLocator;

public class PasswordEncryptor {
	private static Logger log = Logger.getLogger(PasswordEncryptor.class);
	
	
	public String getKey() {
		String key = CoreServiceLocator.getConfiguration().getPasswordEncryptKey();
		if (log.isDebugEnabled())
			log.debug("Key length: " + key.length());
		
		if (key.length() > 8) {
			key = key.substring(0, 7);
		}

		while (key.length() < 8) {
			key = key + "a";
		}
		return(key);
	}
	
	/**
	 * Encodes a string
	 * 
	 * @param str String to encode
	 * @return Encoded String
	 * @throws NoSuchAlgorithmException
	 */
	public String crypt(String str)	{
		if (str.length() > 100) {
			throw new SystemException("Attempt to encrypt string already encrypted: " + str);
		}
		
		if (str == null || str.length() == 0) {
			str = "hexacta";
		}

		StringEncryptor encryptor = new StringEncryptor(getKey(), StringEncryptor.ALGORITHM_DES);
		
		byte[] hex = encryptor.encryptString(str);
		String encryptedText = StringEncryptor.toHex(hex);
		
		return encryptedText;
	}
	
	/**
	 * Encodes a string
	 * 
	 * @param str String to encode
	 * @return Encoded String
	 * @throws NoSuchAlgorithmException
	 */
	public String decrypt(String str)	{
		StringEncryptor encryptor = new StringEncryptor(getKey(), StringEncryptor.ALGORITHM_DES);
		
		
		String decryptedText = encryptor.decryptString(str);
		
		return decryptedText;
	}
	
}
